CODESYS is a leading manufacturer-independent IEC 61131-3 automation software for engineering control systems.
Best OpenPLC Alternatives ranked by AI · updated Aug 2026
OpenPLC is an open-source PLC runtime and programming environment for education, prototyping, and automation experiments. It supports IEC 61131-3 languages and can run on computers, microcontrollers, and selected industrial hardware.
Top 6 OpenPLC alternatives
TIA Portal is a software platform that integrates various automation tools for programming and engineering industrial control systems.
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Outseal is a low-cost PLC platform with a graphical programming environment for students, makers, and small automation projects. It uses ladder-logic programming...
Pros
- Lower-cost entry point than most commercial PLC ecosystems
- Designed for learning ladder logic and practical control projects
- Simple hardware and software pairing for small systems
Cons
- Smaller hardware and software ecosystem than Siemens or Rockwell
- Less suitable for large, safety-critical, or highly integrated installations
- Primarily dependent on Outseal controller hardware
Free software; hardware sold separately
4
Python package for creating beautiful command line interfaces
Pros
- Well-documented
- Good for complex command line applications
Cons
- More focused on command line argument parsing
5
Studio 5000 Logix Designer
Rockwell Automation
Studio 5000 Logix Designer is Rockwell Automation's programming and configuration environment for ControlLogix and CompactLogix controllers. It is built for industrial engineers...
Pros
- More capable for large industrial systems than Outseal
- Strong online diagnostics and controller-management tools
- Supports motion, safety, and multiple IEC-style programming methods
Cons
- Substantially more expensive than Outseal
- Requires Rockwell Logix hardware
- Steeper learning curve and heavier engineering workflow
Paid license; quote-based
6
EcoStruxure Machine Expert
Schneider Electric
EcoStruxure Machine Expert is Schneider Electric's engineering environment for programming and configuring Modicon controllers, HMIs, motion systems, and machine automation devices. It...
Pros
- More complete machine-automation tooling than Outseal
- Supports PLC, HMI, motion, and communication configuration
- Good fit for Schneider Electric machine-control ecosystems
Cons
- Higher total cost than Outseal
- More complicated for simple educational projects
- Best capabilities require Schneider hardware
Paid license; pricing varies by configuration
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